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	Dichlorodifluoromethane
		Dichlorodifluoromethane is a colorless gas with a characteristic ether-like odor; it is pressurized and used in liquid form.
		Before a worker is placed in a job with a potential for exposure to dichlorodifluoromethane, a licensed health care professional should evaluate and document the worker's baseline health status with thorough medical, environmental, and occupational histories, a physical examination, and physiologic and laboratory tests appropriate for the anticipated occupational risks.
		Containers of dichlorodifluoromethane should be protected from physical damage and ignition sources, and should be stored separately from chemically active metals such as sodium, potassium, calcium, powdered aluminum, zinc, and magnesium should be avoided.
	www.osha.gov /SLTC/healthguidelines/dichlorodifluoromethane/recognition.html (3722 words)

	Pre-expanding process and apparatus for the same - Patent 4524154
		The pressure in the pressure vessel at that time was 26 kg./cm..sup.2 G. By opening the valve 5 in the release line 14, the aqueous dispersion was released from the pressure vessel into a low-pressure vessel sealed with water and having a space volume of 32 l through orifices of 3 mm.
		Since dichlorodifluoromethane and the like volatalized from the pellets increased the pressure in the low-pressure vessel during pre-expanding, the valve 12 provided in the recovery line 11 was opened to keep the pressure in the low-pressure vessel to around atmospheric pressure (0.97 to 1.05 kg./cm..sup.2 absolute).
		Then the dichlorodifluoromethane in the pressure vessel, the low-pressure vessel and the collector was liquefied and recovered.
	www.freepatentsonline.com /4524154.html (3753 words)

	410. Dichlorodifluoromethane (WHO Food Additives Series 8)
		Special studies on inhalation The Committee was aware of much literature on the inhalation toxicity of dichlorodifluoromethane.
		However, these occur at relatively high doses and were not considered relevant to the evaluation of the oral toxicity of dichlorodifluoromethane.
		For the purposes of the completeness of this monograph the Committee felt that pertinent references to the inhalation toxicity should be provided (Aviado & Belej, 1974; Aviado & Smith, 1974; Azar et al., 1971; Clayton, 1967; Paulet, 1971; Reinhardt et al., 1971; Taylor et al., 1971; Thompson & Harris, 1974).
	www.inchem.org /documents/jecfa/jecmono/v08je10.htm (1967 words)

	Dichlorodifluoromethane. OSHA Guideline.
		Dichlorodifluoromethane is a colorless gas with a characteristic ether-like odor; it is pressurized and used in liquid form.
		Before a worker is placed in a job with a potential for exposure to dichlorodifluoromethane, a licensed health care professional should evaluate and document the worker's baseline health status with thorough medical, environmental, and occupational histories, a physical examination, and physiologic and laboratory tests appropriate for the anticipated occupational risks.
		Containers of dichlorodifluoromethane should be protected from physical damage and ignition sources, and should be stored separately from chemically active metals such as sodium, potassium, calcium, powdered aluminum, zinc, and magnesium should be avoided.
	www.fluoridealert.org /pesticides/Dichlorodifluorometh.OSHA.htm (3579 words)

	[No title]
		Dichlorodifluoromethane (CCl.sub.2 F.sub.2), also known as CFC-12, Refrigerant-12, or simply R-12, is one of the most commonly used CFC refrigerants in automobile air conditioners and elsewhere.
		While the invention has been described in the Examples and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that only preferred embodiments have been described and that all changes and modifications that come within the spirit of the invention are desired to be protected.
		A ternary mixture of refrigerants that is a drop-in substitute for dichlorodifluoromethane refrigerant in dichlorodifluoromethane refrigeration systems, comprising about 2 to 20 weight percent isobutane, about 21 to 51 weight percent 1-chloro-1, 1-difluoroethane, and about 41 to 71 weight percent chlorofluoromethane, with the weight percentages of said components being weight percentages of the overall mixture.
	www.autofrost.com /peoples/ghg/patent1.txt (3329 words)

	Dichlorodifluoromethane (75-71-8). Adverse Effects. Fluoride Action Network Pesticide Project.
		Exposure of rats to dichlorodifluoromethane resulted in no noticeable differences in the incidence of total benign and malignant tumors, and of the most frequently expected or rate of tumors.
		Uses such as propellants in aerosols which had accounted for about 75% of the release of dichlorodifluoromethane and trichlorofluoromethane, the chemicals of greatest concern (refrigerants and foams accounted for about 14 and 12%, respectively), were banned in the US after Dec 15, 1978(1).
		Previously dichlorodifluoromethane was the principal propellant for non-food aerosols(1) and 60% of dichlorodifluoromethane and trichlorofluoromethane production went into aerosols(1).
	www.fluoridealert.org /pesticides/epage.dichlorodifluorometha.htm%5C (2451 words)

	[No title]
		SUMMARY: The present invention relates to refrigerants generally, and more specifically to a mixture of refrigerants that may be substituted for the environmentally damaging refrigerant dichlorodifluoromethane (R-12).
		The Montreal Protocol and the United States Environmental Protection Agency (EPA) have thus called for a phase out of the use of the CFCs that are known to be contributing to the degradation of the environment, and specifically to ozone layer depletion.
		The method of claim 3 wherein said substituting step consists of drop-in substituting a ternary mixture of about 6 to 10 weight percent isobutane, about 34 to 38 weight percent 1-chloro-1,1-difluoroethane, and about 54 to 58 weight percent chlorodifluoromethane, the weight percentages of said components being weight percentages of the overall mixture.
	www.autofrost.com /peoples/ghg/patent2.txt (3229 words)

	[No title]
		Abstract: Dichlorodifluoromethane is an inert gas that has a long history acting as a refrigerant, allowing us to stay cool in the summer, and as a spray propellant for important consumer substances.
		Dichlorodifluoromethane, that we’ve all come to depend on, unfortunately is associated with some gigantic environmental problems.
		Dichlorodifluoromethane control began in 1979 with an EPA ban on Freons used for cosmetic propellants [21].
	www.wou.edu /~avorder/Refrigeration.htm (3665 words)

	Spectrum Laboratories : Chemical Fact Sheet - Cas # 75718
		dichlorodifluoromethane in the surface water rapidly reaches equilibrium with the concn in the air.
		Dichlorodifluoromethane was detected, but not quantified, in the open waters of Lake Erie.
		Dichlorodifluoromethane was emitted from a simulated landfill composed of municipal refuse and
	www.speclab.com /compound/c75718.htm (974 words)

	Freon - Dichlorodifluoromethane (CF2Cl2) Properties
		Thermodynamic properties - specific volume, enthalpy and entropy - of saturated and superheated Freon - Dichlorodifluoromethane (CF2Cl2)
		Due to its ozone-depleting potential, dichlorodifluoromethane is currently replaced by R134a (1,1,1,2-tetrafluoroethane), R142b (Chloro-1-difluoro-1,1-ethane) or R409a (mixture containing 60 % of R12)
		Air Condition Air Condition systems, heating and cooling of air...
	www.engineeringtoolbox.com /freon-d_972.html (403 words)

	EWG Investigation \| U.S. Tap Water Quality Database (Site not responding. Last check: 2007-10-17)
		Dichlorodifluoromethane (Freon 12) is a refrigerant banned under the Montreal Protocol as of 2000 because of its ozone-depleting properties.
		Potential health impacts associated with Dichlorodifluoromethane include cardiovascular or blood toxicity, gastrointestinal or liver toxicity, neurotoxicity, respiratory toxicity, and skin sensitivity.
		For fifty pollutants the legal limit is higher than health-based levels [see more].
	www.ewg.org:16080 /tapwater/statereports/state_contaminant.php?state=NJ&contam=2212 (255 words)

	Nat' Academies Press, Spacecraft Maximum Allowable Concentrations for Selected Airborne Contaminants: Volume 4 (2000)
		Dichlorodifluoromethane is a colorless, nonflammable gas with almost no odor (ACGIH 1991a).
		Spacecraft Maximum Allowable Concentrations for Selected Airborne Contaminants: Volume 4 B11 Dichlorodifluoromethane (Freon 12) Hector D. Garcia, Ph.D. Johnson Space Center Toxicology Group Medical Operations Branch Houston, Texas PHYSICAL AND CHEMICAL PROPERTIES Dichlorodifluoromethane is a colorless, nonflammable gas with almost no odor (ACGIH 1991a).
		It is an ozonedepleting chlorofluorocarbon and has been used principally as a plastic foam blowing agent, an aerosol propellant, and a refrigerant.
	www.nap.edu /books/0309067952/html/227.html (3108 words)

	Dichlorodifluoromethane (CASRN 75-71-8), IRIS, Environmental Protection Agency
		Except for decreased weight gain in rats (about 20% in females) receiving 3000 ppm (150 mg/kg/day) dichlorodifluoromethane, no other adverse effects were attributed to this compound in either rats or dogs.
		UF -- The NOEL from the 2-year rat study (15 mg/kg/day) and an uncertainty factor of 100 (10 for species extrapolation and 10 for sensitive individuals) were used to derive the RfD of 0.2 mg/kg/day, or 10 mg/day for a 70-kg human being.
		No new health effects data were identified that would be directly useful in the revision of the existing RfD for Dichlorodifluoromethane and a change in the RfD is not warranted at this time.
	www.epa.gov /iris/subst/0040.htm (768 words)

	Dichlorodifluoromethane
		Dichlorodifluoromethane (Freon 12) is produced in large quantities and will be released to the environment as emissions during its production,...
		Dichlorodifluoromethane (R-12), usually sold under the brand name Freon-12, is a chlorofluorocarbon halomethane used as a refrigerant and...
		trichlorofluoromethane (CFC-11, or F-11) and dichlorodifluoromethane (CFC-12, or F-12), have been used extensively as aerosol-spray...
	www.info-storm.com /directory/d/Dichlorodifluoromethane/index.shtml (228 words)

	CHEST: A Controlled Trial of Chlorofluorocarbon-Free Triamcinolone Acetonide Inhalation Aerosol in the Treatment of ... (Site not responding. Last check: 2007-10-17)
		Study objective: To compare the dose response, efficacy, and safety of inhaled triamcinolone acetonide (TAA) with a hydrofluoroalkane (HFA) propellant (75 [micro]g/puff), TAA with a chlorofluorocarbon propellant (dichlorodifluoromethane [P-12]; 75 [micro]g/puff), and placebo in adult patients with persistent asthma.
		Conclusion: HFA and P-12 formulations of TAA inhalation aerosol were therapeutically equivalent and showed comparable safety and dose-related efficacy in the treatment of patients with persistent asthma.
		Approximately 20% of asthma patients use inhaled corticosteroids, and TAA accounts for a significant proportion of that use.
	www.findarticles.com /p/articles/mi_m0984/is_5_116/ai_57892909 (1184 words)

	To Save Money on Dichlorodifluoromethane Click Here for Dichlorodifluoromethane Discount Sources.
		You may qualify to get Dichlorodifluoromethane and your other prescription drugs for free.
		Dichlorodifluoromethane (Freon 12) is produced in large quantities and will...
		Allof the dichlorodifluoromethane that is produced is eventually lost as emissions...
	www.institute-dc.org /res/30/Dichlorodifluoromethane.html (262 words)

	Chemical Names Beginning with the Letter D
		Dichlorodifluoromethane and Difluoroethane azeotropic mixture with approximately 74% Dichlorodifluoromethane
		Dichlorodifluoromethane and Ethylene oxide mixture, with not more than 12.5% Ethylene oxide
		Dichlorodifluoromethane and Ethylene oxide mixtures, with not more than 12% Ethylene oxide
	hazmat.dot.gov /pubs/erg/psn_d.htm (171 words)

	dichlorodifluoromethane - OneLook Dictionary Search
		Tip: Click on the first link on a line below to go directly to a page where "dichlorodifluoromethane" is defined.
		dichlorodifluoromethane : Encarta® World English Dictionary, North American Edition [home, info]
		Dichlorodifluoromethane : Atmospheric Chemistry and Air Quality [home, info]
	www.onelook.com /?w=dichlorodifluoromethane&ls=all (123 words)

	Vapor-Liquid Equilibria for the Systems Difluoromethane + Hydrogen Fluoride, Dichlorodifluoromethane + Hydrogen ... (Site not responding. Last check: 2007-10-17)
		Isothermal vapor-liquid equilibria for difluoromethane + hydrogen fluoride, dichlorodifluoromethane + hydrogen fluoride, and chlorine + hydrogen fluoride have been measured.
		The experimental data for the binary systems are correlated with the NRTL equation with the vapor-phase association model for the mixtures containing hydrogen fluoride, and the relevant parameters are presented.
		The binary system difluoromethane + hydrogen fluoride forms a homogeneous liquid phase, and the others form minimum boiling heterogeneous azeotropes at the experimental conditions.
	pubs.acs.org /cgi-bin/abstract.cgi/jceaax/1998/43/i01/abs/je970142h.html (141 words)

	Chemical Fact Sheets -- Freons
		However, there are state groundwater standards for fluorotrichloromethane (Freon 11) at 3,490 parts per billion (ppb) and dichlorodifluoromethane (Freon 12) at 1,000 ppb.
		Based on the formula, we recommend levels of freons be no higher than 24 parts per million (ppm) of Chlorodifluoromethane; 0.24 ppm of dichlorofluoromethane; 24 ppm dichlorodifluoromethane; 24 ppm of trichlorofluoromethane and 24 ppm of trichlorotrifluoroethane.
		The Federal Clean Air Act Amendments of 1990 specifies how much freons can be released into the air.
	www.dhfs.state.wi.us /eh/ChemFS/fs/Freons.htm (624 words)

	R-12, Dichlorodifluoromethane - Properties, Purity and Packaging "AKA F12", no longer in production, the ...
		R-12, Dichlorodifluoromethane - Properties, Purity and Packaging "AKA F12", no longer in production, the product is missed by the automotive industry - 134a is poor replacement - many alternatives to avoid retrofit that cool more efficiently.
		R-12 EPA approved replacements are RB-276 and Chill-It with no retrofit
		Senior or Executive approval of this product to be purchased is required.
	www.c-f-c.com /gaslink/pure/r12.htm (164 words)

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